Combined typewriting and computing machine



June 12, 1934. O THEME 1,962,470

COMBINED TYPEWRITING AND COMPUTING MACHINE Original Filed June 18, 1928 2 Sheets-Sheet l INVENTORI ATTOR June 12, 1934. 0. THIEME 1,962,470

COMBINED TYPEWRITING AND COMPUTING MACHINE Original Filed June 18, 1928 2 Sheets-Sheet 2 242 250 7.5 255 5 BY ATTOR EY.

Patented June 12,

COMBINED TYPEWRITING AND COMPUTING MACHINE Otto Thieme, Hartford, Conn., assignor to Elliott- Fisher Company, New York, N. Y., a corporation of Delaware Original application June 18, 1928, Serial No. 286,218. Divided and this application October 12, 1931, Serial No. 568,315

6 Claims. (01. 235-59) This invention relates to combined typewriting might incompletely carry over to the wheel of and computing machines in which the numeralnext higher denominational order.

keys of the typewriter drive a master wheel, the This application is a division of my pending latter being employed to rotate the dial-wheels application No. 286,218, filed June 18, 1928.

of a totalizer. Other features and advantages will hereinafter 60 Each dial-wheel usually has a carry-over appear.

mechanism for operating the dial of next higher In the accompanying drawings,

denomination. Sometimes the active train of Figure 1 is a vertical section through an Undials and carry-overs is very long, and the rederwood typewriting ma Showing a tOtaliZel' sistance of so many parts reacts upon the masmounted upon a truck movable with the type- 5 ter Wheel, which may therefore be caused to fall writer-carriage, a totalizer-actuating mechanism a trifle short of executing its full stroke. This at the front of the machine-frame with the asmay cause faulty operations of other parts of the O a d typewriter Da Connected thereto. delicate adding mechanism, and may sometimes ur 2 i an enlarged de Op a ional bring about a mistake in the calculation. View, Showing t th ow g action of an ac- 70 The object of this invention is to overcome tuatins s t p its crank-arm to p nsate this dimculty. To this end, each of the. nine o ac n a o Series O a ymechacams which index the master wheel and also niSmS. drive it, is given a form to impart an excessive Figure 3 is an enlarged vertical section throw to the master wheel. This extra throw throu h the totalizer, and a diagrammatic as- 75 gives th 11; th t th movement proceeds sembly of the operative train of mechanisms bethrough a long train of dials and carry-overs tween the totalizer and a fully depressed nuwith sufilcient reliability to ensure that the final ywheel in the train is properly operated. Upon Figure 4 is an enlar ed front View of the the return stroke of the key, the master wheel master-gear Clutch-Operating onne t ons. 80 stands idle, being unclutched from the key. u e 5 is an enlarged View, P y in Section,

11; lt th t t; every numeral-key t k showing the relative assembly of the master-gear the master wheel is rotated a little too far at one d its dliting clutchrmembels p the Shaft, stage. This excess happens at a point when the as ttype has made abgut. three-quarters or four- The Underwood typewriting machine includes 85 fifths of its'travel to the platen of the typewriter. alphabet-KEYS 39 and numeral-keys which,

The cam is further shaped to cause the master when d p s d, p a key-levers 3 e t ndin wheel to recoil from its overthrown position, or realwaldly t0 fulmum p a D -W re 33 to to bring back the master wheel accurately to a Vibrate a bell-(311111.k 34 Swingable about a ful- 35 perfect position, before the type reaches the paper. CI'QmTWiYE 35, t0 Vlbrate a type-bar 36 a y 90 The riginal extra throw is imparted to swlngable about a, Curved fulcrum-Tire 37, to the master Wheel and to the train of dials and strike the front face of a platen 33 mounted to Carryovers, is therefore an intermediate opem rotate within a platen-frame 39, case-shiftable tion, and is corrected by the key during the ret i a carmfge 40 movable upon. a canjlage 40 mainder or its down stroke so that the desired guldmg rod and further provlded with 95 I w center roll 42 to run upon a track 43 at the impulse 3? th} 0w glven the front of the machine-frame 44. The carriage 40 train without bringing it to a Ialse position at has a feed rack 45 in train with a pinion 46 the Concluslonthat drives an escapement-wheel 47 operative 45 The Cam therefore has a form glVe the through a carriage-motor, not shown, to effect master wheel an excessive stroke and continues letterpacing movements of th carriage by with a further form to restore the master wheel cape-ment-dogs 48 vibrated by a universal bar to its exact desired position, at the conclusion of 49 driven rearwardly through the impact of each the printing stroke of the type-key. type-bar in typing.

50 Still other features are to insure the carrying The computing mechanism may be divided over of each digit-wheel by mechanically overinto two mechanisms, an actuator-mechanism throwing the normal carry-over position, then 67, fixed to the machine-frames, and a totalizerretracting to the true carry-over position, and. mechanism 68 movable with the carriage 40. thus compensating for the slack and resistance The frame preferably is cast with a rail-section I 55 in a long one-way driving train that otherwise 71 along the upper edge, through which a -J-shaped groove 72 is machined to provide bearing faces for rolls 73.

A rail.79, having an inverted V-shaped raceway to ride upon the rolls '73, is driven to and fro by connections with a pair of arms 80, one arm secured at each end of the front rail 81 of the carriage-frame 40 by screws 82, Figure 1.

The rail 79 has permanently secured to the front face thereof a truck 193 for carrying a series of totalizers. Each totalizer may be adjustably secured to establish a computing zone in passing through a stationary actuating mechanism.

Upon shaft 138 there are mounted a series of camming actuators 139, one actuator for each numeral-key.

Each actuator has pivoted at the side thereof, as at 148, a sheet-metal link 149 pendent therefrom with the lower end 150 extending below the plane of the keys, and each link is connected to a key-lever through a pinand-slot connection 160.

The actuator-cams 139 are alike in size and shape, but th scope or" the camining slots 212 varies with each actuator to enable each actuator, when vibrated by its numeral-key, to convey a rocking motion to a universal shaft 213, equivalent to the numerical value of the key depressed; hence the uniform depression of all the numeral-keys uniformly vibrates their actuators 139 a extent, but the variations in the slots 212 convey differential rocking motions to the shaft 213 through each slot engaging a stud 214 carried by crank-arms 215 individual to each actuator and permanently mounted upon the shaft 213 in a straight uniform plane.

The shaft 213 and its series of crank-arms 215 are at the driving end of a connected train of mechanisms operative to positively accompiisl'i a definite result at the driven end of the train, while the actuator-cams are at the end of a driven train actuated by the numeral-keys.

Seciued to the shaft 213 is a crank-arm 221. ihe free end of the arm 221 has a stud 223 projecting from the face thereof, upon which the lower end of a link 224 is mounted, and the upper end of said link is pivotally secured to a gear-sector 225, which in turn is connected to a pinion 242. The depression of a numeral-key moves its link 149 and sector 139 to operate a clutch-mechanism to connect the pinion 242 to the master gear 246 during the printing stroke of the key.

The pinion 242 is the driven element for a train of parts that rotate the master-gear 246, see Figure 5, and are all supported upon a shaft 247 secured to said master-gear, and which rotates within hearings in two brackets (not shown). The pinion 242 is formed integrally with a clutch-member 249 having an even number of slots 256 through the periphery thereof. The pinion 242 and its clutch-member 249 are spaced apart and rotate freely as a unit upon the shaft 247 between a collar 251 and a sleeve 252 flush with the end of the shaft 247. To co-operate with the clutch-member 249 there is mounted on the shaft 247 a clutch-member slidable along said shaft and having a head 253 formed with suitable clutching teeth 254 to interlock within the slots 250 of the clutch-member 249, a second head 255 having diametrically disposed tongues 256 to slidably engage within the slots 257 out through a head 258 forming a part of the master-gear 246. The assembly of these parts, as shown at Figure 5, provides that the clutch-head 253 may be shifted leftward to force the teeth 254 into clutching interlock with the slots 250 of the member 249, but the tongues 256 are not withdrawn from the slots 257 of the master-gear.

It will be noted at Figures 4 and 5 that an annular groove 259 separates the two heads 253 and 255 of the sliding clutch-member, and within this groove 259 a roll 260, pivotally mounted upon the rear face of a crank-arm 261, operates to shift the clutch-member along the shaft 247. The arm 261 may be mounted upon a stud 262 secured to the actuator-frame, and said arm may include a second arm 263 carrying a stud 264 having a groove that rests within the forks 265 of a yoke 266 pivotally straddling the end of a lever 267 secured to a rock-shaft 268 havend bearings in the sides of the frame.

The rock-shaft 268 is vibrated by the initial down stroke of each cam-actuator 139 to close the master-gear driving clutch before motion is transmitted to the gear-sector 225.

The return swing of a cam-actuator 139 will reversely rock the shaft 268 idly and permit the springs 287 and 288 to restore the connections that vibrate the clutch-member of the mastergear.

The totalizer-mechanism includes numeralwheels 303, see Figure 3, idler gears 304, carrying gears 301, star-wheels 305, and carry-over pinions 306.

In a totalizer-mechanism having a long series of numeral-wheels the subtraction of a small number from a series of 0 reverses the carryover movements of the di its to exhibit a long line of 9 at the left of the number computed. The simultaneous reverse carrying from 0 to on so many numeral-wheels indicates a certain resistance the depressed key must overcome, and this extra driving strain placed upon the connections between the key-lever and the master-gear makes it possible that the full depression of a key will not fully rotate the master gear, and the driven numeral-wheel may not be fully rotated to its true register-aligning position.

To prevent such operating conditions, the camming slot 212 in each actuator 139 is formed with an overthrowing extension as 338, to overthrow the master gear 246 and then restore said gear to its correct wheel-arresting position. In this manner the master gear, which has an excess of rotary motion and which is subsequently Withdrawn before the key is fully depressed, insures a true digital movement of the actuated numeral-wheel regardless of any retarding influence of the driven parts.

This overthrowing or overfeedlng extension 338 in the slot 212 of the actuator 139 is indicated at Figure 2 where the stud 214 has completed the overthrow of the master gear 246 and rests upon the highest point of the extension 338 and is about to drop therefrom to a dwell 334 of the slot 212, which drop reverses the direction of rotation for the overfed master gear back to a fixed stop-position until released by the release of the depressed key. The initial restoring movement of the actuator-extension 338 vibrates the stud 214 and its connections in two directions, but these are idle motions because the master gear 246 has been cut off by the opening of the clutch to the driving mechanisms.

The actuators 139 have slots 212, and each slot has an overthrowing formation 338, which overthrowing feature on a single actuator of any denomination will be found sufficient to reduce satisfactorily any spirality in the usual commercial totalizer, which is limited to seven denominations.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting machine having numeral typing keys, the combination with a computing mechanism including numeral-wheels having carry-over connections, one to the other, and a master-gear for driving the numeral-wheels, of means actuated by the numeral-keys and operatively connected to drive and overthrow the master-gear and a numeral-wheel, to insure a complete carry-over, and then restore the same to correct position.

2. In a typewriting machine having numeral typing keys, the combination with a computing mechanism including numeral-wheels having carry-over connections, one to the other, and a master-gear for driving the numeral-wheels, of camming means actuated by the numeral-keys and operatively connected to drive and overthrow the master-gear and a numeral-wheel, to insure a complete carry-over, and then restore the same to correct position.

3. In a combined typewriting and computing machine having numeral-type-keys, a carriage, a totalizer having carry-over trains, and a master-wheel engageable in denominational order with said totalizer by means of said carriage, the combination of a key-operated indexing cam for driving said master-wheel, said cam being formed to impart an excessive throw to the master-wheel and then retract the latter to correct position, and means to disconnect the master-wheel, while in said correct position, from the cam at the conclusion of the printing stroke of the key.

4. In a combined typewriting and computing machine having numeral-type-keys, a carriage, a totalizer having carry-over trains, and a master-wheel engageable in denominational order with said totalizer by means of said carriage, the combination of a set of key-operated indexing cams for driving said master-wheel, each cam being formed to impart an excessive throw to the master-wheel to secure a complete carryover and also to correct the excess throw of the master-wheel during the remainder of the printing stroke of the key to avoid impeding the advance of said carriage which ensues at the end of said printing stroke.

5. In a combined typewriting and computing machine having numeral-type-keys, a carriage, a totalizer having carry-over trains, and a master-wheel engageable in denominational order with said totalizer by means of said carriage, the combination of a set of key-operated indexing cams for driving said master-wheel, each cam formed to impart an excessive throw to the master-wheel to secure a complete carry-over, and means to disconnect the master-wheel from the cam at the conclusion of the printing stroke of the key, the excessive throw taking place at a point before the key has concluded its printing stroke, and the cam being shaped to cause the master-wheel to recoil from its overthrown position to correct position before the disconnection of the master-wheel at the conclusion of the printing stroke of the key.

6. In a machine of the character described having numeral-keys, a set of totalizer-wheels having carry-over trains, a master-wheel, and a carriage advancing at the operation of said keys, to cause the master-wheel to engage with successive totalizer-wheel denominations; mechanism whereby, at the operation of any key, the latter is connected to rotate the master-wheel according to the key-value and to then disconnect the master-wheel, said mechanism being arranged to drive and overthrow the master wheel in excess of said value to insure complete operation of the carry-over trains, and to then retract the master-wheel to the correct position for said value before the key stroke in initial direction is completed and before disconnection of the master-wheel.

' OTTO THIEME. 

